Centrifugal drier



May 20, 1924. v 1,495,075

I H. F. HOYLE I CENTRIFUGAL DRIER Filed Jan.. 6. 1921 2 Sheets-She et 1May 20 1924. 1,495,075

H. P. HOYLE CENTRIFUGAL DRIER Filed Jan. 6, 1921 2 Sheets-Sheet 2Patented May 20, 1924.

HENRY PATRICK HOYLE, OF DURHAM, ENGLAND.

GENTRIFUGAL DRIER.

Application filed January 6, 1921. Serial No. 435,438.

To all whom it may concern e Be it known that I, HENRY PATRICK HOYLE, asubject of the King of Great Britain, residing at 46 North Bailey,Durham, England, have invented new and useful Improvements inCentrifugal Driers, of which the following is a specification.

This invention relates to improvements in centrifugal driers, and itsobject is to Pro vide an improved drier which shall be especiallysuitable for drying coal but may be used for drying other materials.According to this invention I provide within a vertical cylindricalscreen a perforated vertical drum having upon its periphery a scroll andI provide means for' rotating both the screen and the drum, the lat? terat a slower speed than the former, so that the scroll moves the materialdown through the drier, whilst the whole is being rotated. In some casesI may provide at the bottom of the drum a fan adapted as the drumrotates to draw air into the interior thereof and I perforate the sidesof thedrum, to allow this air to pass through the material and so assistin drying it. Vanes may also be provided at the top of the screen aroundthe periphery thereof to exhaust the air.

The screen is preferably constructed of segments secured together, eachsegment consisting of a metal frame supporting anumber of vertical rodsmounted on which are wedge shaped wires.

A disintegrator may be fixed to the shaft upon which the screen ismounted.

My invention is illustrated by the accompanying drawings, Figure 1 ofwhich is a vertical section through a drier, Figure 2 is a section on alarger scale of part of the screen,F igure 3 is an elevation of one ofthe segments of the screen, Figure 4 is a plan thereof and Figure 5 anenlarged perspective view of part of the screen.

A central shaft 1 has a shoulder 2 at which is keyed a spider 3, theperiphery of which carries a circular wedge wire screen 4 whilst thearms form a fan 5 for drawing air through a duct 6 and discharging itthrough the screen 4. At the top of the screen 4 are attached fan blades7 which draw air in an upward direction throu h the screen 4. At thelower end of shaft 1 1s keyed a cylinder 8 on the outer side of whichare fixed bars 9 on whose outer ends rings 10 are threaded and rivetedthereto.

The shaft 1 is supported by a thrust bear ing 11 and rotates in a ballbearing 12 and bushings 13 within a hollow shaft '14 on whose lower endis a flange carrying a drum 15, on the barrel of which is formed ascroll 16 having an increasing pitch in its downward direction. Thebarrel of the drum consists of a series of vertical flat bars, thespaces between which Et-llOVLOf the passage of air from the fan 5. Theshaft 14 rotates in a ball bearing 17 and is supportedin thrust bearing18. The shaft 1 is driven by mitre wheels 19 and 20 having spiral teethandthe hollow shaft 14 is driven by bevel wheels 21 and 22 having spiralteeth, the mitre wheel 19 and bevel wheel 21 being mounted on acountershaft 23 rotating in ball bearings 24 and 25 and driven by a beltpulley 26. The rotating par-ts are enclosed in a casing built up in fourmain parts 27, 28, 29 and 30.

The part 27 carries the bearings of the countershaft 23 and the bearingsof the shaft 14. The part 28 surrounds the screen 4. The part 29 has aninclined circular duct 31 which receives the separated water and carriesthe bearings for the shaft 1. The part 30 carries two or more rows ofbars 32 on to whose ends rings 33 are threaded and riveted thereto. Thebars 32 form with the bars 9 a disintegrator. To the lower flange of thepart 30 is attached a hopper 34. A chute '35 delivers the wet coal tothe machine.

The screen may be made bf-perforated plates or bars, but I prefer toconstruct it as shown in Figures 2 to 5. 36 is a frame secured to thetop and bottom plates of the screen and supporting verticalrods 37 roundwhich are coiled wires 38 of circular section at the parts surroundingthe rods 37, the parts between the rods being wedge shaped as shown inFigures 4 and 5. The coiled wires 38 abut against each other and holdthe wedge shaped parts at the desired distance apart. Alternating withthe rods 37 are other rods 39 which need not be secured to the top andbottom members of the frame 36 The operation of the machine is asfollows Wet coal is delivered to the machine through the chute 35 andfalling upon the outer surface of revolving drum 15 is thrown bycentrifugal force upon the revolving screen 4. The scroll 16 rotating inthe same direction as the screen '4 but at a somewhat lesser speedgradually scrapes the coal downwards along the faceof the screen, andowing to the increasing pitch of the scroll the film of descending coalbecomes deeper andthinner, the extraction of the water thereby beingfacilitated. As the film of coal is descending a current of air producedby the fan 5 on the spider 3 assisted by theblades 7 is forcedthrough-the coal and ascending through openings in part 27, carries awaya portion of the moisture. The coal from the screen falls upon therevolving bars 9 of the disintegrator below and is broken up into'finedust and falls into the hopper 34. The water which has been forcedthrough the screen passes into the inclined duct 31 and flows ,to thelowest point where an outlet is provided.

What I claim is 1. In a centrifugal drier, the combination of a shaft, avertical, cylindrical screen fixed to the shaft, a hollow shaft mountedupon the first-mentioned shaft, a perforated, vertical drum fixed to thehollow shaft, a scroll on the outside of the drum. a fan on the shaftbelow the drum for forcing air through the perforated drum and throughthe screen, fan blades atv the top of the screen for exhausting air fromthe drier, and means for rotating the shafts at different speeds.

2. In a centrifugal drier, the combination of a shaft, a vertical,cylindrical screen fixed to the shaft, ahollow shaft mounted upon thefirst-mentioned shaft, a perforated. vertical drum within the screen andfixed to the hollow shaft, a scroll of increasing pitch fixed to thedrum, a fan on the first-mentioned shaft below the drum for forcing airthrough the drum and the screen, andmeans for rotating the shafts atdifferent .speeds.

3. In a centrifugal drier, the combination of a vertical. cylindricalscreen constructed of wedge-shaped wires, a perforated, vertical drumwithinihescreen. a scroll on the drum for feeding material down throughthe drier. and means for rotating the screen and drum at differentspeeds.

4. In a centrifugal drier. the combination of a shaft, avertical.cylindrical screen constructed of wedge-shaped wires fixed tothe shaft, a hollow shaft mounted on the other shaft, a perforated,vertical drum fixed to the hollow shaft Within the screen, a scroll onthe drum, a fan on the shaft below the drum, and means for rotating theshafts at different speeds. t

5. In a centrifugal drier. the combination of a shaft, a vertical,cylindrical screen fixed to the shaft, a hollow shaft mounted on thefirst-mentioned shaft, a perforated, vertical drum fixed to the hollowshaft, a scroll of increasing pitch from one end to the other on theoutside of the drum and between the drumand the screen, a fan on theshaft below the drum for forcing air through the drum and the screen.and means for rotating the two shafts at different speeds.

6. In a centrifugal drier. the combination of a vertical, cylindricalscreen constructed of wedge-shaped wires, a perforated vertical drumwithin the screen. a scroll of increasing pitch from one portion toanother on the drum for feeding material down through the drier, andmeans for rotating the screen and drum at different speeds.

' 7. In a' centrifugal drier. the combination of a shaft, a vertical,cylindrical screen con-' structed of wedge-shaped wires fixed to theshaft, a hollow shaft mounted on the other shaft, a perforated vertical'drum fixed to the hollow shaft within the screen, a scroll ofincreasing pitch from one portion to another on the drum, a fan on theshaft below the drum, and means for rotating the shafts at differentspeeds.

- 8. In a centrifugal drier, the combination of a. vertical, cylindricalscreen constructed of sections of wedge-shaped wires, a perforated,vertical drum within the screen. a scroll on the drum for feedingmaterial down through the drier, and means for rotating the screen anddrum at difierent speeds.

9. In a centrifugal drier. the conlbination of a shaft, axertical-erlindrical screen constructed of sections of wedge-shapedwires fixed to the shaft. a hollow shaft mounted on the other shaft. aperforated. vertical drum fixed to-the hollow shaft within the screen. ascroll on the drum. a fan on the shaft below .the drum, and means forrotat ing the shafts at different speeds.

In testimony that I claim the foregoing as my invention I have signed inname this 23rd day of December, 1920.

HENRY PATRICK HOYLE.

